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2026. Evaluation of Nano-Scale ZnO Coatings Prepared via the Sol–Gel Method on Cast Iron Piston Rings: Tribological Performance. ENERGY: JURNAL ILMIAH ILMU-ILMU TEKNIK. 16, 2 (Sep. 2026), 501–518. DOI:https://doi.org/10.51747/energy.v16i2.p501-518.